Papers by Author: Chao Ping Cen

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Authors: Zi Jun Tang, Chao Ping Cen, Ping Fang, Yang Ming Liang
Abstract: In this study, a sewage sludge-base activated carbon (SSAC) was prepared by means of ZnCl2 chemical activation-pyrolysis-carbonization. Different factors such as activated temperature, activators, additives, sludge/activation solution ratio, activated time and other factors which affecting SSAC characteristics were studied to obtain the optimal preparation conditions. The result shows that when using 3mol/L zinc chloride with the ratio of zinc chloride to sulfuric acid as 10:1(v/v), activated at 550°C with the ratio of sludge to activation solution as 1:4(w/v) for 1 hour of pyrolysis and the rate of N2 was set at 0.5L/min, the BET surface area, total pore volume and average pore diameter of the SSAC was 469.80m2/g, 0.16cm3/g and 2.60nm respectively. Using SSAC to treat simulating wastewater containing 100mg(Ni2+)/L, the removal rate of Ni2+ was 20.59% with the adsorption capacity of 10.57mg/g. When the pH>10.5 the removal efficiency approached 100%.
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Authors: Ping Fang, Chao Ping Cen, Hong Tao Zhang, Zi Jun Tang, Ding Sheng Chen, Zhi Hang Chen, Zhao Lin Chen
Abstract: Efficient and cost-effective sludge-based adsorbents were developed and the adsorption of VOCs on the sludge-based adsorbents was studied in a fixed bed reactor. The results indicate that the adsorption of VOCs on sludge-based adsorbents is typical physical adsorption, the dynamic adsorption capacity of VOCs on adsorbents sharply increases as the VOCs concentration is increased at first, then increasing gradually, at last retains stable with the change of VOCs concentration. The dynamic adsorption capacity of sludge-based adsorbents for VOCs is O-Xylene > Butylcetate > Toluene > Ethylacetate > Benzene > Propanone > n-Hexane, the maximum dynamic adsorption capacity is 0.247, 0.225, 0.192, 0.186, 0.180, 0.176, 0.133g/g, respectively. Meanwhile the adsorption of VOCs on sludge-based adsorbents corresponds to the Langmuir adsorption isotherm equations. The sludge-based adsorbent is a low-cost alternative to activated carbon for VOCs treatment, and this technology is a promising method for the VOCs removal.
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Authors: Zhi Hang Chen, Zhi Xiong Tang, Chao Ping Cen, Huan Mu Zeng, Ding Sheng Chen, Ping Fang
Abstract: In this dissertation, combinatorial chemistry was adopted, and the activities of a series of VCuMn/TiO2 catalysts prepared by impregnation method for middle-low temperature SCR of NOx were evaluated. The activity datas showed that 2V2Cu8Mn/TiO2 exhibited better activity. At 200 °C, above 70% NOx conversion were both obtained with a gas hourly space velocity of 60,000 h-1, and NOx conversion of 2V2Cu8Mn/TiO2 reached nearly 100% at 275~325 °C. The X-ray diffraction characterization showed that the CuO and Mn2O3 phases in VCuMn/TiO2 catalysts were the main active site and with better SCR activity at middle-low temperature. In addition, sulfur-resistance of VCuMn/TiO2 catalysts were investigated, NOx conversion on 2V2Cu8Mn/TiO2 was above 60% at 250 °C after feeding SO2 (600 ppm). It can be concluded that the modified VCu/TiO2 catalyst by adding manganese obtained a good de-NOx activity in a high sulfur content gas stream.
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Authors: Zhi Hang Chen, Xue Hui Li, Chao Ping Cen, Xiang Gao, Le Fu Wang
Abstract: The solid state reaction method, coprecipitation method and citric acid method were employed for the preparation of Cr-Mn mixed-oxide catalysts. Experimental results showed that this catalytic system has good selective catalytic reduction (SCR) properties of NOx by ammonia in the presence of excess oxygen at low temperature (80-220°C). 97.8% conversion of NOx with 100% selectivity of N2 had been achieved on Cr-MnOx mixed oxide prepared by the citric acid method at 120°C with the space velocity of 30,000 h-1. X-ray diffraction, BET were adopted for the characterization of the active phase. The characterization results showed that a new crystal phase CrMn1.5O4 generated in mixed oxides which was the active center of the Cr-Mn catalysts.
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Authors: Ding Sheng Chen, Chao Ping Cen, Zhi Xiong Tang, Ping Fang, Zhi Hang Chen
Abstract: Three surfactant, sodium dodecyl sulfate (SBS), sodium dodecylbenzene sulfonate(SDBS), Polyoxyethylene Sorbitan Monolaurate(Tween 20), Turkey red oil sodium salt(TROS), were prepared and tested as composite adsorbents to remove chlorinated volatile organic component from exhaust gas. A gas–liquid absorption equipment was used to evaluate the performance of composite adsorbents. It is found that the three composite adsorbents could all effectively remove chlorobenzene but their absorption abilities were rather different. The maximum removal efficiency of chlorobenzene is composite absorbent TROS with low surface tension, reached as high as 85%, much greater than those of Tween 20 and SDBS (38% and 65%, respectively).
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